High speed modulation semiconductor laser

Abstract

The invention discloses a high-speed modulation semiconductor laser, which comprises a resonant cavity and an arched optical waveguide, wherein the resonant cavity is positioned on the concave side of the arched optical waveguide and forms two coupled zones with the arched optical waveguide; the resonant cavity is provided with a gain region generating the gain, a phase tuning region and a separated region positioned between the gain region and a phase region; the arched optical waveguide positioned between two coupled zones is provided with a modulation region for loading a modulation signaland modulating an absorption coefficient, a gain coefficient or a phase. A certain constant current is loaded in the phase tuning region; the phase fine tuning is realized by utilizing electro-effect, so as to ensure that the phase of the arched optical waveguide is matched with the phase of the resonant cavity; a modulation signal is led into the modulation region of the arched waveguide to change the threshold value of laser oscillation, thereby achieving high-speed modulation. The high-speed modulation semiconductor laser has the advantages of low threshold value and low frequency chirp; furthermore, the structure is simple, the manufacture is convenient, and the integration is easy.

Description

technical field [0001] The invention relates to a semiconductor laser, in particular to a high-speed modulation semiconductor laser, which belongs to the field of optoelectronic devices. Background technique [0002] In recent years, with the rapid development of the Internet and information interaction, people have put forward high-speed and large-bandwidth requirements for optical communication network data transmission. To achieve high speed (such as greater than 40Gb / s), it is necessary to develop high-speed modulated lasers. At first, people obtained a certain modulation rate by directly modulating the laser injection current. This is the easiest method, but there is an inherent modulation rate limitation due to the chirp. Since then, people have achieved high-speed modulation of a continuous output laser by means of an external modulator. Compared with the direct modulation method, this external modulator method has greatly improved the modulation rate, but this met...

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Problems solved by technology

Compared with the direct modulation method, this external modulator method has greatly improved the modulation rate, but this method still has some shortcomings: the modulator is separated from the laser, it is difficult to achieve monolithic integration, and there is a certain chirp Chirp, it is difficult to meet the higher modulation rate requirements, and the extinction ratio is small, and there is also the problem of high cost

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